linux-kernel - Re: [PATCH] cpufreq: set value of CPUFREQ_BOOST

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Message-ID: <CAKohponR2YZJYAeCMCpXaQ7oztGdgiG8PKNvt9sgvKQM3VCD9g@mail.gmail.com>
Date:	Fri, 28 Mar 2014 14:25:04 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Lists linaro-kernel <linaro-kernel@...ts.linaro.org>,
	"cpufreq@...r.kernel.org" <cpufreq@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	"ego@...ux.vnet.ibm.com" <ego@...ux.vnet.ibm.com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Lukasz Majewski <l.majewski@...sung.com>,
	Viresh Kumar <viresh.kumar@...aro.org>
Subject: Re: [PATCH] cpufreq: set value of CPUFREQ_BOOST_FREQ to 0xABABABAB

On 24 March 2014 12:18, Viresh Kumar <viresh.kumar@...aro.org> wrote:
> Ideally, .driver_data field of struct cpufreq_frequency_table must not be used
> by core at all. But during a recent change if its value is same as
> CPUFREQ_BOOST_FREQ macro, then it is treated specially by core.
>
> The value of this macro was set to ~2 earlier, i.e. 0xFFFFFFFD. In case some
> driver is using this field for its own data and sets this field to -3, then with
> two's complement that value will also become 0xFFFFFFFD.
>
> To fix this issue, lets change value of this flag to a very uncommon value which
> shouldn't be used by any driver unless they want to use BOOST feature.
>
> Along with this update comments to make this more clear.
>
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---

Please discard this patch now as I have sent a replacement patch.
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